US8568567B2ActiveUtilityA1

Shoe press belt

Assignee: HAGFORS SATUPriority: Dec 12, 2008Filed: Dec 10, 2009Granted: Oct 29, 2013

Est. expiryDec 12, 2028(~2.3 yrs left)· nominal 20-yr term from priority

Inventors:Satu Hagfors Vesa-Matti Riihioja Marja Ojanen

C08G 18/76C08G 18/48D21F 3/02D21H 25/005C08G 18/10C08G 18/4854C08G 18/7614D21F 3/0227D21F 7/08

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References

Claims

Abstract

The invention relates to a shoe press belt comprising polyurethane polymer prepared of a urethane prepolymer containing isocyanate groups and a chain extender, the urethane prepolymer being prepared using 1,4-phenylene-diisocyanate (PPDI) and the chain extender comprising methyl-bis(3-chloro-2,6-diethylaniline) (MCDEA).

Claims

exact text as granted — not AI-modified

The invention claimed is: 
     
       1. A shoe press belt comprising polyurethane polymer prepared of a urethane prepolymer containing isocyanate groups and a blend of chain extenders, the urethane prepolymer being prepared using 1,4-phenylene-diisocyanate (PPDI) and the blend of chain extenders comprising methyl-bis(3-chloro-2,6-diethylaniline) (MCDEA). 
     
     
       2. A shoe press belt according to  claim 1 , wherein the chain extender comprises at least 10% by weight of MCDEA. 
     
     
       3. A shoe press belt according to  claim 1 , wherein the chain extender comprises more than 25% by weight of MCDEA. 
     
     
       4. A shoe press belt according to  claim 1 , wherein the urethane prepolymer is made of 1,4-phenylene-diisocyanate and polytetramethylene ether glycol (PTMEG). 
     
     
       5. A shoe press belt according to  claim 1 , wherein the urethane prepolymer is made of 1,4-phenylene-diisocyanate and polyether carbonate polyol.

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